sqlserver内存、会话、连接查询

1、连接查询

select * from sysprocesses where dbid in (select dbid from sysdatabases where name='dbname')
--或者
SELECT * FROM
[Master].[dbo].[SYSPROCESSES] WHERE [DBID] IN ( SELECT
   [DBID]
FROM
   [Master].[dbo].[SYSDATABASES]
WHERE
   NAME='dbname'
)

2、当前正在执行的sql查询

SELECT  [Spid] = session_id ,
            ecid ,
            [Database] = DB_NAME(sp.dbid) ,
            [User] = nt_username ,
            [Status] = er.status ,
            [Wait] = wait_type ,
            [Individual Query] = SUBSTRING(qt.text,
                                           er.statement_start_offset / 2,
                                           ( CASE WHEN er.statement_end_offset = -1
                                                  THEN LEN(CONVERT(NVARCHAR(MAX), qt.text))
                                                       * 2
                                                  ELSE er.statement_end_offset
                                             END - er.statement_start_offset )
                                           / 2) ,
            [Parent Query] = qt.text ,
            Program = program_name ,
            hostname ,
            nt_domain ,
            start_time
    FROM    sys.dm_exec_requests er
            INNER JOIN sys.sysprocesses sp ON er.session_id = sp.spid
            CROSS APPLY sys.dm_exec_sql_text(er.sql_handle) AS qt
    WHERE   session_id > 50 -- Ignore system spids.
            AND session_id NOT IN ( @@SPID ) -- Ignore this current statement.
ORDER BY    1 ,

清理存储过程预编译等缓存、会话缓存、系统缓存、缓存区

 DBCC FREEPROCCACHE
 DBCC FREESESSIONCACHE
 DBCC FREESYSTEMCACHE('All')
 DBCC DROPCLEANBUFFERS 

--内存使用情况
SELECT * FROM sys.dm_os_performance_counters
WHERE counter_name IN ('Target Server Memory (KB)','Total Server Memory (KB)') 

-- 内存状态
DBCC MemoryStatus 

--查看最小最大内存
SELECT
cfg.name AS [Name],
cfg.configuration_id AS [Number],
cfg.minimum AS [Minimum],
cfg.maximum AS [Maximum],
cfg.is_dynamic AS [Dynamic],
cfg.is_advanced AS [Advanced],
cfg.value AS [ConfigValue],
cfg.value_in_use AS [RunValue],
cfg.description AS [Description]
FROM
sys.configurations AS cfg 

--设置最小最大内存 

sp_configure 'show advanced options', 1 

go
sp_configure 'min server memory', 0
RECONFIGURE
GO 

sp_configure 'max server memory', 2147483647
RECONFIGURE
GO 

sp_configure 'max server memory', 256
RECONFIGURE
GO
sp_configure 'show advanced options', 0 

CREATE proc [dbo].reclaimmemory  --强制释放内存

as

begin

 DBCC FREEPROCCACHE
 DBCC FREESESSIONCACHE
 DBCC FREESYSTEMCACHE('All')
 DBCC DROPCLEANBUFFERS

exec sp_configure 'max server memory', 256
EXEC ('RECONFIGURE' )

WAITFOR DELAY '00:00:05'

EXEC  sp_configure 'max server memory', 2147483647
EXEC ('RECONFIGURE' )
GO

end